Ireduce_scatter#
The benchmark for MPI_Ireduce_scatter
that measures communication
and computation overlap. It reduces a vector of length
L = X/sizeof(float)
float items. The MPI data type is MPI_FLOAT
.
The MPI operation is MPI_SUM
. In the scatter phase, the L
items
are split as evenly as possible. To be exact, for np
number of
processes:
L = r*np+s
where
r = ⌊L/np⌋
s = L mod np
In this case, the process with rank i
gets:
r+1
items wheni<s
r
items whenis
Property |
Description |
---|---|
Measuredpattern |
|
MPI data type |
|
MPI operation |
|
Reportedtimings |
For details, see Measuring Communication and Computation Overlap. |
Reportedthroughput |
None |